In textile mills a white substance having a strong smell of chlorine is used to remove yellowness of white clothes. Identify the substance. How is it prepared? Write chemical equation of reactions involved.

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Solution

1. Bleaching powder
Bleaching powder is an important chemical compound used in textile industries and laboratories. Its chemical name is Calcium oxychloride $({CaOCl}_{2})$ . It is white in appearance and has a strong smell of chlorine.
2. Preparation method
It is prepared by the reaction of Slaked lime with Chlorine. The reaction for its preparation is shown below.
$Ca {(OH)}_{2} (aq) + {Cl}_{2} (g) \to {CaOCl}_{2} (aq) + H_{2} O (l) (Slaked lime) (Chlorine) (Bleaching powder) (Water)$
The substance used in textile mills to remove the yellowness of white clothes is Bleaching powder.

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